Some of this is absolutely a bias on the part of student selection, not the school. Even amongst the public schools, to some extent (of course, a much lesser extent) - MSUCOM's OOS tuition probably deters plenty of out of staters from accepting if they have another option. In that list of schools with most IS representation, I was accepted at 2 of the top 7 from out of state (and invited to interview at one that I declined). It happens. I'm not matriculating at either of those schools though, and I'm sure I'm not alone, hence the high representation of in state students.